REST API: Protect against fatal error for post types without format support.

Ignore the `format` parameter introduced in WordPress 6.7 for post types that do not support post formats. This protects against a fatal error being thrown in later version of PHP or a warning in earlier versions of PHP.

Follow up to r59115.

Props dd32, sergeybiryukov, yogeshbhutkar.
Fixes #62646.
See #62014.

Built from https://develop.svn.wordpress.org/trunk@59544


git-svn-id: http://core.svn.wordpress.org/trunk@58930 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

@@ -346,7 +346,7 @@ class WP_REST_Posts_Controller extends WP_REST_Controller {
 
 		$args = $this->prepare_tax_query( $args, $request );
 
-		if ( ! empty( $request['format'] ) ) {
+		if ( isset( $registered['format'], $request['format'] ) ) {
 			$formats = $request['format'];
 			/*
 			 * The relation needs to be set to `OR` since the request can contain

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.8-alpha-59543';
+$wp_version = '6.8-alpha-59544';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.